tend, tens, tent = to stretch 伸
attend：at-(ad)=to 向；tend = to stretch 伸；
【v】①注意；专心：Please attend to what he is saying. 注意听他说。②出席： to attend a meeting 出席会议；
extend：ex-=out 出；tend= to stretch 伸；
【v】①伸出：He extended his arms in front of him. 他向前伸出手臂。②延长；扩大：We are to extend the railway to the city. 我们计划把铁路延长到那座城市。
intend：in-=upon 在···上面；tend = to stretch 伸；
【v】①打算：What do you intend to do next？ 下一步你打算怎么办？②意指：What did he intend by that remark? 他说那话是什么意思？
pretend：pre-=before 在···之前；tend= to stretch 伸；
【v】①声称；自称：He pretends to be a scholar. 他自称学者。②伪称；假装：Don’t pretend to know what you do not know. 不要不懂装懂。
intense：in-=to 到；tens = to stretch 伸；-e；
【adj】①紧张的：intense but orderly work 紧张而有秩序的工作；②极度的：intense heat 酷热；③强烈的：intense sorrow 强烈的悲痛；
tense：tens= to stretch 伸展；-e；
Ⅰ【adj】绷紧的；紧张的：tense situation 紧张的形势；
Ⅱ【v】拉紧；使紧张：to tense the muscles 绷紧肌肉；
tend：tend = to stretch 伸；
【v】①伸向；趋向：The prices are tending upward. 物价趋于上涨。②倾向：to tend to optimism 有乐观主义倾向；
contend：con-=together 共同；tend= to stretch 伸展；
【v】①竞争；斗争：to contend for spheres of influence 争夺势力范围；②争论：He often contends against me. 他常常与我争论。
distend：dis-=away 开；tend= to stretch 伸展；
【v】①扩伸；膨胀：Iron distends by heat. 铁受热膨胀。②肿胀：The injured wrist began to distend up. 受伤的腕部开始肿起来。
ostentation：os-(obs-)= in front of 在···之前；tent = to stretch 展开；-ation [n]表行为；
【n】①炫耀；卖弄：I hate ostentation in any form. 我讨厌任何形式的虚伪。②出风头：to be free from ostentation. 杜绝风头主义。